# Flat-Branched Tree-Clubmoss (*dendrolycopodium obscurum*) The Flat-Branched Tree-Clubmoss is a captivating, primitive vascular plant that blankets the forest floors of eastern North America. Resembling a miniature coniferous forest, this ancient survivor belongs to an evolutionary lineage that pre-dates the dinosaurs, once growing as massive trees during the Carboniferous period. Today's clubmosses are much smaller, but they retain their primitive charm with rich, evergreen foliage and a unique reproductive cycle that relies on spores rather than seeds. Stumbling upon a patch of these vibrant, tree-like plants on a forest walk feels like discovering a secret, prehistoric world. Highly valued for their architectural beauty, they play a quiet but vital role in their ecosystems, helping to bind the soil, retain moisture, and provide critical ground-level microhabitats for tiny forest invertebrates. - **Category:** [Plants](https://www.snappit.app/explore/categories/plant) - **Rarity:** Common - **Danger:** 1/5 · Very low - **Snaps:** 5 - **Habitat:** Thrives in moist, acidic soils of deciduous and mixed coniferous forests, often under the shade of hemlocks, oaks, and pines. ![Flat-Branched Tree-Clubmoss](https://inaturalist-open-data.s3.amazonaws.com/photos/16961329/medium.jpeg) Photo: Judy Gallagher, CC BY-SA 4.0 · [iNaturalist](https://www.inaturalist.org/photos/16961329) ## Appearance This species typically grows between 10 to 30 centimeters tall, featuring upright, woody stems that branch repeatedly to form a flat-topped, fan-like crown resembling a tiny pine tree. The scale-like leaves are needle-like, glossy, and deep green, arranged in six distinct ranks along the branches. In late summer, fertile stems produce erect, candle-like spore cones (strobili) at their tips, which turn a dusty yellowish-brown when mature. The plants spread via creeping horizontal rhizomes that run just beneath the leaf litter, often creating dense, uniform carpets. ## Taxonomy - **Kingdom:** Plantae - **Phylum:** Tracheophyta - **Class:** Lycopodiopsida - **Order:** Lycopodiales - **Family:** Lycopodiaceae - **Genus:** Dendrolycopodium ## Interesting facts - Despite looking like miniature pine trees or mosses, clubmosses belong to an entirely distinct evolutionary lineage of lycophytes, which are primitive vascular plants. - The spores are so hydrophobic that coating your hand in them allows you to dip your hand into water and pull it out completely dry. - The spores of this plant, known as lycopodium powder, were once used by early photographers as flash powder and by pharmacists to coat pills to prevent them from sticking. ## Special abilities - **Lycopodium Flash:** Dry spores contain high amounts of flammable oils, allowing them to ignite instantly when suspended in the air, a physical trait that aids in rapid wind dispersal. - **Clonal Pioneer:** Spreads aggressively using subterranean rhizomes, allowing a single genetic individual to survive, expand, and colonize large areas even when spore reproduction fails. - **Mycorrhizal Lifeline:** The underground gametophyte stage is completely non-photosynthetic and relies entirely on symbiotic mycorrhizal fungi to obtain organic nutrients for several years. ## Measurements & details - **Length:** 10-30 cm - **Lifespan:** 5-20 years ## Diet & Feeding As a photosynthetic plant, it generates its own food using sunlight, water, and carbon dioxide, while extracting essential mineral nutrients from the soil. - **Age differences:** The subterranean gametophyte stage is entirely non-photosynthetic and parasitic on mycorrhizal fungi, whereas the mature sporophyte stage is photosynthetic. - **Primary Foods:** Sunlight, Water, Carbon Dioxide, Nitrogen, Phosphorus ## Ecological connections - **Mutualism:** Arbuscular Mycorrhizal Fungus (*Rhizophagus irregularis*) — Forms an obligate symbiotic relationship where the fungus provides nutrients to the developing clubmoss gametophyte. - **Competitor:** [Eastern Hemlock](https://www.snappit.app/explore/eastern-hemlock) (*Tsuga canadensis*) — Grows alongside and competes for floor space, soil moisture, and filtered sunlight in mature eastern forests. ## Safety **Danger:** 1/5 · Very low No special safety notes yet. ## Frequently Asked Questions ### How to identify Flat-Branched Tree-Clubmoss? Start with the whole plant, then compare leaf arrangement, leaf edges, stems and any flowers or fruit. Opposite leaves grow in pairs; alternate leaves come one at a time along the stem. These details tell you far more together than a single green leaf does. Plant Identifier: upload a photo and compare the visible details. ### How long is Flat-Branched Tree-Clubmoss? 10-30 cm ### How long does Flat-Branched Tree-Clubmoss live? 5-20 years ### What does Flat-Branched Tree-Clubmoss eat? As a photosynthetic plant, it generates its own food using sunlight, water, and carbon dioxide, while extracting essential mineral nutrients from the soil. ### Where is Flat-Branched Tree-Clubmoss usually found? Thrives in moist, acidic soils of deciduous and mixed coniferous forests, often under the shade of hemlocks, oaks, and pines. ## Where to spot - [Chesham](https://www.snappit.app/guides/places/chesham) — New Hampshire, US · Historic District - [Elk Neck State Forest](https://www.snappit.app/guides/places/elk-neck-state-forest) — Maryland, US · Forest - [Oak Knoll Wildlife Sanctuary](https://www.snappit.app/guides/places/oak-knoll-wildlife-sanctuary) — Massachusetts, US · Nature Reserve - [Shenipsit Trail](https://www.snappit.app/guides/places/shenipsit-trail) — Connecticut, US · Trail - [Mattatuck State Forest](https://www.snappit.app/guides/places/mattatuck-state-forest) — Connecticut, US · Forest [View all places to see Flat-Branched Tree-Clubmoss](https://www.snappit.app/guides/where-to-see/flat-branched-tree-clubmoss) ## More Plants - [white snakeroot](https://www.snappit.app/explore/white-snakeroot) (*Ageratina altissima*) - [tree-of-heaven](https://www.snappit.app/explore/tree-of-heaven) (*Ailanthus altissima*) - [western sword fern](https://www.snappit.app/explore/western-sword-fern) (*Polystichum munitum*) - [common milkweed](https://www.snappit.app/explore/common-milkweed) (*Asclepias syriaca*) --- Source: [Flat-Branched Tree-Clubmoss: Facts & Places to See — Snappit](https://www.snappit.app/explore/flat-branched-tree-clubmoss)